From the Beginning of Warhammer, the Heavens Were Illuminated

[Rebellious Primarch + Demon-Slaying System + Farming + Warhammer Universe + Chuunibyou (adolescent delusions of grandeur)]

As a lucky one who traveled through Warhammer.

Ron had read countless online novels since childhood, always preparing for a time travel adventure. He never imagined that he would be transported to the unfamiliar world of Warhammer.

Moreover, it seems I arrived a bit early; the Great Expedition hasn't even begun yet.

Just when he thought he was the chosen one, he learned that the name of his pitiful, harmless brother beside him was 'Angron'.

I feel like I've become a supporting character?

In the dark thirtieth millennium, the Emperor had just completed the unification of Terra, and the children of the gods were scattered among the earth.

In this world of rotting flesh, the Emperor leads humanity back towards the light.

He was 'fortunate' enough to obtain the system for slaying heretics, and from then on, he got closer and closer to his dream.

The "Great Records of the Thousand Thousand Years," written casually from memory, became Sinai's most treasured possession.

Psychic powers? That's just a way to become a psychic.

Enhance your eyesight? Then let me ask you, [Amaterasu], are you afraid?

Ron rescued Angron during his innocent childhood and treated him like a brother.

The Emperor was very pleased when he arrived in Nuthria. Seeing Angron seated high on the throne of the planet's ruler, Angron roared at the Emperor's fleet:

"Where did this heretic come from! My brother is an unparalleled power throughout the ages, come down here and die!"

The emperor did not blame him and still took Angron away.

Ron also became a squad leader in the Twelfth Legion because of Angron.

Horus rebelled even when he was sent to a planet filled with 'WAAAGH!' to support the Great Sage and to bring back the latest research results.